Polyvinylalcohol composite film, preparation method thereof and method of preparing nano composite powder for preparing the polyvinylalcohol composite film

Abstract

The invention discloses a preparing method of polyvinyl alcohol coextruded film and nanometer composite powder body for preparing coextruded film, which comprises the following steps: resolving defect of current adding amidon; allocating 120-180 wt polyvinyl alcohol, 30-90 wt amidon, 2.0-2.2 wt nanometer ZnO / SiO2 composite powder and 85-95 wt glycerin; mixing polyvinyl alcohol, amidon, nanometer ZnO / SiO2 composite powder and glycerin; cooling; melting; squeezing thin film; getting the thin film; adding polyacrylic acid, poly-sodium acrylate or triethanolamine, wetting agent-436, defoaming agent-50A and nanometer ZnO into distilled water; emulsifying; pre-dispersing; dipping into Na2SiO3 and sulfuric acid; aging; depositing; drying; grinding; getting the nanometer ZnO / SiO2. The tensile strength of thin film can reach at 17.5-30.48MPa and elongation at break at 406.25%-462.50%.

Description

technical field [0001] The invention relates to a composite film, a preparation method thereof and a preparation method of nanocomposite powder used for preparing the composite film. Background technique [0002] Polyvinyl alcohol (PVA) is a water-soluble polymer with many unique properties. It has excellent biodegradability, which makes it occupy a unique and very important position in film materials. At present, the sol-gel method and the solution blending method are used to prepare polyvinyl alcohol films, but the current methods limit the production of PVA films due to factors such as low concentration of casting solutions, low production capacity, and high energy consumption. promotion and application. Since the PVA molecule contains a large number of hydroxyl groups, it can form a large number of intramolecular and intermolecular hydrogen bonds, so that the melting temperature (195°C) of PVA is very close to the decomposition temperature (210°C), and it is easy to dec...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the defects of poor mechanical properties, easy damage, large energy consumption and low production capacity of the existing polyvinyl alcohol composite film filled with starch, and sol-gel method and solution blending method casting film-forming technology, And provide a kind of polyvinyl alcohol composite film and its preparation method and the preparation method of the nanocomposite powder that is used for preparing polyvinyl alcohol composite film